Neocallichirus grandimana ( Gibbes, 1850 )

Pachelle, Paulo P. G. & Tavares, Marcos, 2020, Axiidean ghost shrimps (Decapoda: Axiidae, Callianassidae, Callichiridae Micheleidae) of the Trindade and Martin Vaz Archipelago, Vitória-Trindade Seamounts Chain and Abrolhos, off southeastern Brazil, Zootaxa 4758 (1), pp. 103-126 : 116-119

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Neocallichirus grandimana ( Gibbes, 1850 )


Neocallichirus grandimana ( Gibbes, 1850)

( Figures 10–12 View FIGURE 10 View FIGURE 11 View FIGURE 12 )

Trindade specimens. 1 male, cl 4.7 mm, 1 female, cl 8.0 mm ( MZUSP 36406 View Materials ), Brazil, off Espírito Santo, Trindade Island, Ponta Norte , 20º29’18.7’’S– 29º20’18.3’’W, 14.2 m, coll. J.B. Mendonça Jr, 02.vii.2015 GoogleMaps . 4 females, cl 6.1– 7.4 mm ( MZUSP 36407 View Materials ), idem, 13.3 m, 05.vii.2012 GoogleMaps . 1 male, cl 7.6 mm, 3 females, cl 6.0–9.0 mm ( MZUSP 36408 View Materials ), idem, 12.8 m, 17.vii.2013 GoogleMaps . 1 male, cl 10.9 mm ( MZUSP 40076 View Materials ) , 1 male 17.5 mm ( MZUSP 40078 View Materials ) , 1 female, cl 12.5 mm ( MZUSP 40079 View Materials ), idem, 10.7 m, 27.xi.2017 . 1 male, cl 5.0 mm ( MZUSP 36405 View Materials ) , 1 female, cl 7.1 mm ( MZUSP 36404 View Materials ), idem, 20º29’40.2’’S– 29º20’32.9’’W, 14.2 m, coll. J.B. Mendonça Jr, 07.v.2014 GoogleMaps . 2 males cl 12.2, cl 21.1 mm ( MZUSP 36410 View Materials ), Ponta do Monumento , 20º30’10.3’’S– 29º20’36.1’’W, 12.1 m, coll. J.B. Mendonça Jr, GoogleMaps . 1 male, cl 13.5 mm, 1 female, cl 15.1 mm ( MZUSP 29587 View Materials ), Praia da Calheta / SECON, 20º30’20.9’’S– 29º18’43.7’’W, 12.3 m, coll. J.B. Mendonça Jr, GoogleMaps . 3 males, cl 7.5–13.0 mm, 1 female, cl 12.7 mm ( MZUSP 29588 View Materials ), idem, 03.vii.2012 GoogleMaps . 1 male, cl 22.5 mm ( MZUSP 29589 View Materials ) , 1 female, cl 11.5 mm ( MZUSP 29590 View Materials ), idem, 11 m, 11.xi.2014 . 1 female, cl 19.9 mm ( MZUSP 36409 View Materials ), Praia do Lixo , 20º31’29.8’’S– 29º19’43.9’’W, 14.5 m, coll. J.B. Mendonça Jr, 22.iv.2014 GoogleMaps . 4 females, cl 8.0–10.0 mm ( MZUSP 40080 View Materials ), idem, 22.xi.2017 GoogleMaps . 1 female, cl 6.4 mm ( MZUSP 36403 View Materials ), idem, 20º31’33.9’’S– 29º19’33.6’’W, 18.5 m, coll. J.B. Mendonça Jr, 06.vii.2015 GoogleMaps .

Comparative material examined. Neocallichirus grandimana . United States: 1 female, cl 8.0 mm ( MZUSP 26419 View Materials ), Florida, Gulf of Mexico coast, Boca Grande, S.A. Rodrigues coll., 10.ii.1967 . Brazil: 3 females cl. 11.0– 17.0 mm ( MZUSP 26417 View Materials ), Rio Grande do Norte, Natal, along right margin of Potengi River , near a Yatch Club, S. A. Rodruigues coll., 25.ii.1984 . 1 male, cl. 9.5 mm ( MZUSP 18588 View Materials ), Bahia, Coroa Vermelha, Praia Grande, M. Tavares coll., 10.i.2007 . Neocallichirus cacahuate Felder & Manning, 1995 . 1 male, cl 8.4 mm ( MZUSP 32615 View Materials ) , Brazil, Ceará, Icapuí, Praia de Tremembé , sand-mud flat, in burrow, suction pump, coll. P. Pachelle, 10.ii.2014 .

Distribution. Western Atlantic: Bermuda, east and west coasts of Florida, Bahamas, Belize, Cuba, Puerto Rico, Barbados, Curaçao, Tobago, Venezuela, and Brazil (Pará, Ceará, Paraíba, Pernambuco, Bahia, Trindade Island) ( Coelho et al. 2007; Sakai 2011; Pachelle et al. 2017; present study). Eastern Atlantic: Mexico, Colombia, Ecuador ( Lemaitre & Ramos 1992; Ayón-Parente et al. 2014).

Remarks. The present collection contains numerous specimens of different sizes, which allowed for the examination of changes in morphology over ontogeny. We found that the rostrum is more pronounced and acute in the developing specimens, becoming distinctly shorter and blunter in adults ( Figure 11 View FIGURE 11 A–D). The sharp tooth at the carapace infraorbital angle of developing specimens is missing in the adults ( Figure 11 View FIGURE 11 A–D). The distal projection of the ocular peduncles is broadly rounded in the developing specimens, whereas in adults it becomes narrower and develops into a lateral blunt tooth ( Figure 11 View FIGURE 11 A–D). The much larger cornea of the developing specimens occupies most of the width of the ocular peduncle (see also Felder and Manning 1995), whose ocular pigment is well distributed in the ommatidia, whereas with growth the cornea reduces gradually reduced to a third of the width of the ocular peduncle while the ocular pigment becomes more concentrated in the most central ommatidia ( Figure 11 View FIGURE 11 A–D). In the developing specimens the telson bears a median sharp tooth on its distomesial margin and cuspidate setae on the distolateral margins, while in adults the telson median sharp tooth is absent and the cuspidate setae distinctly smaller ( Figure 11E, F View FIGURE 11 ). The uropodal endopods are narrower in the developing specimens than in adults ( Figure 12E, F View FIGURE 12 ). Finally, young individuals have the major first pereopod merus, carpus and propodus generally smoother on the lower margins and slender fingers, whereas in larger specimens the lower margins of merus, carpus and propodus are more toothed and the fingers wider dorsoventrally ( Figure 12G, H View FIGURE 12 ).

Developing specimens of N. grandimana can be confused with N. cacahuate Felder & Manning, 1995 , a species previously known from USA (Florida) and Venezuela (Sucre), and recently reported from the northeastern Brazilian coast by Pachelle et al. (2017). Felder & Manning (1995) have discussed the shared characters between developing specimens of N. grandimana and N. cacahuate ; the following remarks are in addition to their findings. The developing female of N. grandimana illustrated herein (MZUSP 36404), as well as other small specimens examined, is similar to the male MZUSP 32615 of N. cacahuate in the presence of a sharp tooth on the infraorbital angle, in the strongly bulbous, wide corneas, and in the major pereopod 1 merus, carpus and propodus obscurely toothed ventrally and chela fingers slender ( Figures 11A View FIGURE 11 , 12G View FIGURE 12 . For N. cacahuate , see Pachelle et al. 2017: figs. 4A, 5A). In addition, in the developing female MZUSP 36404 from Trindade the carapace frontal margin and the development of the eyes are similar to those of the immature (cl 7.2 mm) female paratype of N. cacahuate from Florida ( Figure 11A View FIGURE 11 . For N. cacahuate , see Felder & Manning 1995: fig. 5a). Developing specimens of N. grandimana also have the right maxilliped 3 propodus distal margin notched, while full-grown specimens have entire propodal distal margins ( Figure 12 View FIGURE 12 A–B). Sometimes, however, the notched and entire conditions are found in the right and left maxilliped 3 propodus, respectively, of the same developing specimen ( Figure 12 View FIGURE 12 C–D). Similarly, the developing specimens MZUSP 32615 of N. cacahuate have slightly notched propodal distal margin ( Pachelle et al. 2017: fig. 4c), whereas the full-grown male holotype has entire propodal distal margins ( Felder & Manning 1995: fig. 2g). Both, full-grown and developing specimens of N. grandimana can be separated from N. cacahuate especially by the major cheliped carpus being less than half of the palm length (vs. carpus almost as long as palm in N. cacahuate ), and the rounded lateral lobe on the male pleopod 1 (vs spine-shaped in N. cacahuate ) ( Figure 12G, H View FIGURE 12 . For N. cacahuate , see Felder & Manning 1995: fig. 1b, c, e, f).

Lemaitre & Ramos (1992) compared specimens of N. grandimana from the Pacific coasts of Colombia and Ecuador with the neotype from Florida, and concluded that they were conspecific. Recently, Ayón-Parente et al. (2014) reported three additional specimens from the tropical eastern Pacific ( Mexico) but, while acknowledging the morphological similarities between the Pacific and Atlantic counterparts, questioned the identity of the Pacific populations on the ground that amphi-American distributions for tropical shallow water species are not likely to occur. Until more compelling evidence is available, the known range of N. grandimana is herein regarded as widely disjunct.

Coelho & Coelho-Santos (1993) recorded N. grandimana from northern Brazil (Pará). Although likely, this record cannot be evaluated because the aforementioned authors referred to no voucher specimens for it. The present material from Trindade Island represents the southernmost record of the species in the South Atlantic.