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Decapoda: Brachyura) ^^z^ JOURNAL OF CRUSTACEAN BIOLOGY, 16(3): 556-563, 1996 r PARTIAL REVISION OF PINNOTHERID CRAB GENERA WITH A TWO-SEGMENTED PALP ON THE THIRD MAXILLIPED (DECAPODA: BRACHYURA) Ernesto Campos ABSTRACT Two new genera in the Pinnotheridae are recognized from the northwestern Atlantic, Gem- motheres, new genus (type species Pinnotheres chamae Roberts, 1975) and Tunicotheres, new genus (type species Pinnotheres moseri Rathbun, 1918). These genera shared a 2-segmented palp on the third maxilliped with Calyptraeotheres Campos, 1990, Dissodactylus Smith, 1870, Ostracotheres H. Milne Edwards, 1853, and Xanthasia White, 1846. They differ in shape, texture, and hardness of the carapace, shape and relative length of third maxilliped articles, relative length of the walking legs, and relative length and shape of their articles. Comparisons among these genera are provided in a dichotomous key based on adult female characters. During the last five years I have studied Museum, Leiden, and Museum National d'Histoire the systematics of a subgroup of pinnothe- Naturelle, Paris; and Calyptraeotheres granti (Glassell, 1933), O. subglobosus (Baker, 1907), O. holothuriensis rid crabs which are characterized by a two- (Baker, 1907), Epulotheres sp., and other genera with segmented palp on the third maxilliped a three-segmented palp (see Campos, 1993; Manning, (lacking a dactylus). The first result of this 1993a), including P. pisum (Linnaeus, 1767) (type spe­ study was the erection of the genus Calyp­ cies of Pinnotheres Bosc, 1802), from the Inverte­ traeotheres Campos, 1990 (type species brates Collection, Facultad de Ciencias, Universidad Autonoma de Baja California, Mexico. Original figures Fabia granti Glassell, 1933) from the Mex­ were made with a camera lucida. Measurements are in ican Pacific. This work led to the systematic mm. The third maxilliped is abbreviated to MXP3 and reassessment of the remaining American the walking legs are indicated as WL1-WL4. The di­ Pinnotheridae with a two-segmented palp agnoses and key are based on adult females only. on the third maxilliped. Pinnotheres moseri SYSTEMATICS Rathbun, 1918, and P. chamae Roberts, 1975. The analysis of several morphologi­ Gemmotheres, new genus cal and ecological features has led to the Figs. lA-C, 2A-F conclusion that: (1) P. moseri and P. cha­ Diagnosis.—Carapace suborbicular, soft, mae do not belong in the genus Pinnotheres smooth, membranous, widest medially, Bosc, 1802 [type species P. pisum (Linnae­ regions undefined, lacking both sharp an­ us, 1767)] or any other named genera in the terolateral border and longitudinal depres­ sions (sulci), front deflexed, narrow. Eyes Pinnotheridae, and (2) several autapomor- not visible in dorsal view. MXP3 with is­ phies separate these taxa at the generic lev­ chium and merus indistinguishably fused, el. inner distal angle of merus absent; palp 2- segmented, carpus shorter but wider than MATERIALS AND METHODS styliform propodus. Exopod with incom­ pletely bisegmented flagellum. WL sym­ All nominal genera in the Pinnotherinae sensu lato metrical except second pair with left dactyl (see Rathbun, 1918;Tesch, 1918; Schmitt <>/a/., 1973) were analyzed, most by study of actual specimens. In longer than right one; relative lengths of some cases, e.g., Durkheimia besutensis Serene, 1967, right WL 1 > 3 > 4 > 2, of left WL 1 > Ostracotheres qffinis H. Milne Edwards, 1853, and 2 > 3 > 4; relative lengths of right dactyli those genera named in Manning (1993b), it was nec­ 4 > 3 > 2 = 1, of left dactyli 4 = 2 > 3 essary to rely on descriptions and figures in current > 1. Abdomen wider than long, 6 somites literature. and telson free. Specimens of Pinnotheres chamae, P. moseri. and Male.—Unknown. Dissodactylus meilitae Rathbun, 1900, were studied from material deposited in the National Mu.seum of Type Species.—By present designation and Natural History, Smith.sonian Institution, Washington, monotypy Pinnotheres chamae Roberts, D.C.; Ostracotheres tridacnae (Riippell, 1830) (type 1975. species of Ostracotheres H. Milne Edwards, 1853), Ostracotheres cynthiae Nobili, 1905b, and O. spondyli Etymology.—From the Latin gemma, jewel, Nobili, 1905a, from the Nationaal Natuurhistorisch and the ending theres. 556 CAMPOS: PINNOTHERID CRAB GENERA WITH 2-SEGMENTED PALP 557 Fig. 1. Gemmotheres chamae (Roberts, 1975). Female. A, dorsal view; B, frontal view; C, chela. Carapace width = 5.0 mm. 558 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 16, NO. 3, 1996 Fig. 2. Gemmotheres chamae (Roberts, 1975). Female. A, B, MXP3, outer and inner face, respectively; C-F, right WL 1-4; D', carpus, propodus, and dactylus of left WL2. CAMPOS: PINNOTHERID CRAB GENERA WITH 2-SEGMENTED PALP 559 Gender.—Feminine. 1895; Serene, 1967), but D. besutensis Ser­ Host.—In the jewel box Chama congregata ene, 1967, possesses a two-segmented palp. (Bivalvia) attached to coral nodules (Rob­ The species besutensis was erroneously as­ erts, 1975). signed within Durckheimia. In addition to the two-segmented palp on MXP3, besuten­ Distribution.—Knov^n only from the type sis differs from Durckheinia spp., as fol­ locality, off the North Carolina coast, lows: carapace dorsally and ventrally irreg­ U.S.A. ularly pitted, lacking longitudinal ridge and Remarks.—See below. upturned margins; MXP3 with ischium and merus indistinguishably fused, lacking in­ Tunicotheres, new genus ner angle, and exopod tapering distally with Fig. 3A, B, 4A-F inner and outer margins concave and fla­ gellum one-segmented (see Serene, 1967, Diagnosis.—Carapace subpentagonal, firm but not hard, uneven, dorsal regions elevat­ figs. 4, 5). The generic status of besutensis ed and well defined, front produced, arcu­ remains uncertain, but it definitely does not ate, medially emarginated, anterolateral belong in Durckheimia. border rounded. Eyes visible in dorsal view. Based on the material studied, and from MXP3 with ischium and merus indistin- accounts in Serene (1967) and Campos guishably fused, inner angle of merus ab­ (1990), I recognize six genera in the Pin­ sent; carpus subquadrate with rounded dis­ notheridae sensu lato with a two-segmented tal angles, shorter than oblong propodus. palp on MXP3: Calyptraeotheres Campos, Exopod with one-segmented flagellum. WL slender, symmetrical, relative length 2-4 > 1990, Dissodactylus Smith, 1870, Gem- 1, WL4 articulated to body dorsad to WL3, motheres, new genus, Ostracotheres H. dactyli with straight base and curved spi- Milne Edwards, 1853, Tunicotheres, new niform tip, those of last pair longer, swim­ genus, and Xanthasia White, 1846. The ge­ ming setae on WL2 and WL3. Abdomen nus Epulotheres Manning, 1993c, has three longer than width, with medial longitudinal segments in the palp of MXP3 instead of elevation, of 6 somites and telson free. two as originally diagnosed (Manning, per­ Male.—Unknown. sonal communication). Type Species.—By present designation and As noted in the taxonomic key given be­ monotypy. Pinnotheres moseri Rathbun, low, the genera Gemmotheres and Tuni­ 1918. cotheres resemble Ostracotheres. Funda­ mental morphological differences between Etymology.—¥rom Latin, tunica, tunic, and these genera including shape, texture and the ending, theres. hardness of the carapace, shape and relative Gender.—Feminine. length of MXP3 articles, and relative length Hosts.—Commensal in ascidians, Ascidia of WL and relative length and shape of nigra Savigny, Molgula occidentalis Traus- their articles, particularly the propodus and tedt, and Polycarpa obtecta Traustedt (see dactylus. Manning (1993c) discussed sev­ Goodbody, 1960; Roberts, 1975). Also eral bioecological features of T. moseri from sea squirts, dredged in 17 feet (5.5 m) (Rathbun) and G. chamae (Roberts). Both from "... rocky bottom covered with grass are symbionts of different kinds of host, and thin layers of sand and mud ..." Mollusca-Bivalvia and Urochordata-Asci- (Rathbun, 1918). dacea, respectively. This is interpreted as divergent traits and provide support for the Distribution.—Western Florida; Jamaica. proposed new genera. Remarks.—Campos (1990) pointed out that five genera in the Pinnotheridae contain one KEY TO PINNOTHERID CRAB GENERA WITH or more species with the palp of MXP3 2-SEGMENTED PALP ON MXP3, BASED ON composed by two segments (see below). ADULT FEMALES Durckheimia should not have been includ­ 1. Dactyli of WL bifurcated in both male and female ed, since its type species, D. carinipes de Dissodactylus Smith, 1870 (West Atlantic [U.S.A. to Brasil]; East Pacific [Mexico to Peru]; Man, 1889, has a carapace with a longitu­ type species Dissodactylus nitidus Smith, 1870; dinal ridge, upturned margins, and three hosts, Echinodermata-Echinoidea: Clypeaster, Echi segments on the palp of MXP3 (see Burger, arachnius, Encope, Leodia, Mellita, Plagiobrissus) 560 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 16, NO. 3, 1996 Fig. 3. Tunicotheres moseri (Rathbun, 1918). Female. A, dorsal view; B, ventral view. Carapace width = 7 mm. CAMPOS: PINNOTHERID CRAB GENERA WITH 2-SEGMENTED PALP 561 Fig. 4. Tunicotheres moseri (Rathbun, 1918). Female. A, B, MXF3, outer and inner face, respectively; C, exopod of MXP3; D, E, right cheliped, outer and inner face, respectively; F, frontal view. 562 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 16, NO. 3, 1996 - Dactyli of WL simple 2 Campos, E. 1990. Calyptraeotheres, a new genus of 2. Carapace rounded, with upturned lateral margins Pinnotheridae for the limpet crab Fabia granti Glas­ and medial mushroom-shape tubercle sell, 1933 (Crustacea, Brachyura).—Proceedings of Xanthasia White, 1846 (Indo-west
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