Morphological and molecular characterisation of Californian species ...

More documents

Recommendations

Info

S. Álvarez-Ortega et al. = Aporcelaimellus efficiens (Cobb in Thorne & Swanger, = Aporcelaimellus silvanus Vinciguerra & Giannetto, 1936) Baqri & Khera, 1975 1983 M. indicus (Baqri & Jairajpuri, 1968) comb. n. ∗ M. subhasi (Gantait, Bhattacharya & Chatterjee, 2006) = Aporcelaimellus indicus Baqri & Jairajpuri, 1968 comb. n. ∗ M. insignis (Loos, 1945) comb. n. ∗ = Aporcelaimellus subhasi Gantait, Bhattacharya & Chatterjee, 2006 = Dorylaimus insignis Loos, 1945 = Eudorylaimus insignis (Loos, 1945) Andrássy, 1959 M. sublabiatus (Thorne & Swanger, 1936) Andrássy, = Aporcelaimellus insignis (Loos, 1945) Baqri & Khera, 2001 1975 = Dorylaimus sublabiatus Thorne & Swanger, 1936 = Thonus insignis (Loos, 1945) Andrássy, 1986 = Eudorylaimus sublabiatus (Thorne & Swanger, 1936) M. invisus (Tjepkema, Ferris & Ferris, 1971) Andrássy, Andrássy, 1959 2001 = Aporcelaimus sublabiatus (Thorne & Swanger, 1936) = Aporcelaimellus invisus Tjepkema, Ferris & Ferris, Brzeski, 1962 1971 = Aporcelaimellus sublabiatus (Thorne & Swanger, 1936) M. labiatus (de Man, 1880) Andrássy, 2001 Thorne, 1974 = Dorylaimus labiatus de Man, 1880 M. thornei (Álvarez-Ortega & Peña-Santiago, 2010) = Eudorylaimus labiatus (de Man, 1880) Andrássy, 1959 comb. n. ∗ = Aporcelaimium labiatum (de Man, 1880) Loof & = Aporcelaimellus sublabiatus apud Thorne (1974) Coomans, 1970 = Aporcelaimellus thornei Álvarez-Ortega & Peña-Santiago, 2010 = Aporcelaimus conicaudatus Altherr, 1953 (syn. by Andrássy, 2001) = Aporcelaimellus conicaudatus (Altherr, 1953) Monteiro, 1970 ∗ See additional notes below. = Aporcelaimellus jugeti Altherr, 1974 in partim (see Species inquirendae Andrássy, 2001) M. littoralis (Orselli & Vinciguerra, 1999) comb. n. ∗ M. angusticollis Andrássy, 2001 [by Álvarez-Ortega & Peña-Santiago, 2010a] = Aporcelaimellus littoralis Orselli & Vinciguerra, 1999 = Aporcelaimellus capitatus apud Thorne, 1974 M. marinensis sp. n. M. monohystera (Brzeski, 1964) Andrássy, 2009 NOTES ON SOME SPECIES = Drepanodorus monohystera Brzeski, 1964 = Paraxonchium monohystera (Brzeski, 1964) Altherr & Metaporcelaimus ahmadi sp. n.: Ahmad (1995) studied an Indian population identified as Aporcelaimellus Loof, 1969 M. oceanicus Andrássy, 2001 coomansi Baqri & Khera, 1975, also known from India and later transferred to Metaporcelaimus by Andrássy = Aporcelaimellus conicaudatus apud Williams (1959) = Aporcelaimellus conicaudatus apud Heyns (1995) (2001). Nevertheless, Ahmad’s description differed from M. ovogranulosus sp. n. the original one in several morphometrics, being longer M. parangalitzi (Ilieva & Eliava, 1993) comb. n. ∗ (1.88-2.27 vs 1.68-1.90 mm long) and more slender (a = = Aporcelaimellus parangalitzi Ilieva & Eliava, 1993 38-51 vs 32-33), with a comparatively shorter neck (b = M. parmus (Thorne, 1974) comb. n. ∗ 4.3-4.8 vs 3.8-4.1) and pharyngeal expansion (45-52 vs = Aporcelaimellus parmus Thorne, 1974 53-55% of total neck length), and presence of males vs absent. Both populations are thus easily distinguishable and, M. placus (Thorne, 1974) comb. n. ∗ = Aporcelaimellus placus Thorne, 1974 despite the few specimens (four females) studied in each M. raniensis (Altherr, 1968) comb. n. ∗ case, their differences are herein considered significant = Aporcelaimellus raniensis Altherr, 1968 enough to support a separate status. Thus, Ahmad’s material is considered to belong to a new species, Metaporce- M. romanicus (Popovici, 1978) Andrássy, 2001 = Aporcelaimus romanicus Popovici, 1978 laimus ahmadi sp. n., named in honour of Prof. Dr. W. M. shamimi (Ahmad, 1995) comb. n. ∗ Ahmad, who originally studied this Indian material. = Aporcelaimellus shamimi Ahmad, 1995 Metaporcelaimus chauhani comb. n.: The conical tail M. silvanus (Vinciguerra & Giannetto, 1983) comb. n. ∗ with finely rounded tip of this species supports its in- 20 Nematology
Studies on Metaporcelaimus clusion in Metaporcelaimus rather than Aporcelaimellus. Jana and Baqri (1981) described three females and one male belonging to this species but having a larger general size (body length 1.51-1.90 mm in females, 1.88 in male) which exceeds the range of the type population (body length 0.96-1.42 in females, no male) and raises some doubts as to the identity of this material. Metaporcelaimus conoidus comb. n.: A recent reexamination of type material of this species (Álvarez- Ortega & Peña-Santiago, 2010a) revealed that some of its distinctive features (inner cuticle layer apparently bearing a terminal discontinuity; slender body, a = 36-42; and conical tail with rounded terminus, c ′ = 1.3) better fit the pattern of Metaporcelaimus than that of Aporcelaimellus. Metaporcelaimus cylindricus comb. n.: The true identity of this taxon deserves further study, but the morphology of its tail (conical, lacking a continuous and refractive inner layer) supports its provisional transference to Metaporcelaimus. Metaporcelaimus donghwaens comb. n.: The general morphology of this species, especially that of the caudal region, perfectly fits the new concept (conical tail, inner cuticle layer bearing a distinct discontinuity, inner core with a terminal digitation) of Metaporcelaimus and justifies its transference to this genus. Metaporcelaimus efficiens: The true identity of this species remains obscure. Thorne & Swanger’s (1936) original description is very poor in detail, but Andrássy (2001) transferred it from Aporcelaimellus to Metaporcelaimus, an action which is provisionally followed here. Thorne & Swanger (1936) mentioned that Dorylaimus efficiens was very similar to D. simplex, also originally described by them, a species recently transferred from Metaporcelaimus to Aporcella by Álvarez-Ortega et al. (2013). On the other hand, M. efficiens is very similar, if not identical, to M. raniensis (see below), from which it can be distinguished by minor morphometric differences derived from the study of only one female in each case. Metaporcelaimus indicus comb. n.: Andrássy (2001) regarded this species as a junior synonym of M. mombucae, but there are several morphometric differences between them, namely larger (L = 2.40-2.45 vs 1.83-2.34) and more slender (a = 49-52 vs 28-42) body, more posterior vulva (V = 57-58 vs 50-56), comparatively shorter tail (c = 41-43 vs 30-36) and male unknown vs known. On the other hand, assuming that the pars refringens vaginae is absent, the general morphology of this species also fits that of some members of Discolaiminae, although the general size is larger. Hence, further studies are needed to clarify its identity, although its conical tail and resemblance to M. mombucae suggests it should be provisionally classified under Metaporcelaimus rather than under Aporcelaimellus. Metaporcelaimus insignis comb. n.: A recent re-examination of type material of this species (Álvarez-Ortega & Peña-Santiago, 2011) revealed that some of its distinctive features (slender body, a = 35-40; and conical tail with finely rounded terminus, c ′ = 1.6-1.9) better fit the pattern of Metaporcelaimus than that of Aporcelaimellus. Metaporcelaimus littoralis comb. n.: Although the original description of this species is not very detailed, the morphology of the caudal region (conical with rounded terminus, apparently with a terminal discontinuity of inner cuticle layer, and short or notched inner core) seems more similar to Metaporcelaimus than to Aporcelaimellus, the reason why it is transferred to the former genus. Metaporcelaimus parangalitzi comb. n.: Tail morphology (conical with inner core forming a terminal digitation) in this species fits well the Metaporcelaimus pattern. Metaporcelaimus parmus comb. n., M. placus comb. n. and M. thornei comb. n.: Álvarez-Ortega & Peña- Santiago (2010a) have recently re-described or described these species on the basis of type material. In all three cases the tail is conical, with the inner cuticle layer weakly refractive and discontinuous at the end, and the inner core irregular and with terminal digitation. Metaporcelaimus raniensis comb. n.: Altherr’s (1968) original description of this species, based on only one female, lacks many details and contains some inconsistencies, for instance the morphometrics of the caudal region significantly differ when data from text and those obtained from illustrations are compared. Andrássy (2002b) regarded it as a junior synonym of Aporcelaimellus taylori Yeates, 1967, but there are some relevant differences between both taxa: more slender body in M. raniensis (a = 44 vs 29), pars refringens vaginae present vs absent, and more posterior vulva (V = 57 vs 50). It is herein regarded as a valid species and, due to its conical tail with inner core nearly reaching the terminus, provisionally classified under Metaporcelaimus. Metaporcelaimus shamimi comb. n.: Tail morphology (conical with finely rounded tip with a terminal discontinuity of inner cuticle layer) in this species fits well the Metaporcelaimus pattern. Metaporcelaimus silvanus comb. n.: The conical tail with finely rounded tip of this species supports its inclusion in Metaporcelaimus. Vol. 00(0), 2012 21
Page 1 and 2: Nematology 00 (2012) 1-28 brill.nl/
Page 3 and 4: Studies on Metaporcelaimus Fig. 1.
Page 7 and 8: Studies on Metaporcelaimus MEASUREM
Page 11 and 12: Studies on Metaporcelaimus Table 2.
Page 13 and 14: Studies on Metaporcelaimus iii) hig
Page 15 and 16: Studies on Metaporcelaimus with nar
Page 17 and 18: Studies on Metaporcelaimus Vol. 00(
Page 19: Studies on Metaporcelaimus Fig. 8.
Page 23 and 24: Studies on Metaporcelaimus Table 3.
Page 25 and 26: Studies on Metaporcelaimus 21. Long
Page 27 and 28: Studies on Metaporcelaimus Ilieva,

Morphological and molecular characterisation of Californian species ...

Create successful ePaper yourself

Delete template?

Save as template?