Dorippe trilobata, MANNING, 1993

Guinot, Danièle, 2023, A new subfamily classification of the highly diversified Dorippidae H. Milne Edwards, 1837 (Crustacea, Decapoda, Brachyura, Dorippoidea), using morphological, molecular and palaeotonlogical data, with special emphasis on its unique female reproductive system, Zoosystema 45 (9), pp. 225-372 : 258-261

publication ID	https://doi.org/ 10.5252/zoosystema2023v45a9
publication LSID	urn:lsid:zoobank.org:pub:69C34731-8C25-4A1E-B336-B222CD3CBAC3
DOI	https://doi.org/10.5281/zenodo.8071402
persistent identifier	https://treatment.plazi.org/id/03CDBE74-9327-B502-CE38-FA94FEE9F813
treatment provided by	Felipe
scientific name	Dorippe trilobata
status

Treatment

REMARKS ON DORIPPE TRILOBATA MANNING, 1993 View in CoL AND DORIPPE GLABRA MANNING, 1993

Two Doripp e from Australia described by Manning (1993; see Davie 2002: 156), each known only by its type specimen and thus by a single sex, and never reported since, are problematic. The characters used to distinguish them from other known species are tenuous and mainly concern the more or less marked ornamentation and especially the setation and size of the legs. Previously, only two dorippids were known from Australia: Dorippe quadridens and Paradorippe australiensis . Thanks to photographs of the types of each of these species deposited in the AM, kindly sent to us by Shane Ahyong, some remarks can be provided.

Dorippe trilobata ( Manning 1993: 3, 4, fig. 4; cited by Davie 2002: 156), described from Western Autralia (Admiralty Gulf) on the basis of the single holotype, a male 20.5 × 21.1 mm, was considered to be close to D. tenuipes Chen, 1980 . Both species were regarded as “different from all other species of Dorippe in having elongate P2 and P3, with the P3 merus six or more times longer than high”, although to a lesser degree in D. tenuipes . In D. trilobata the P2 and P3 ( Fig. 15A, B View FIG ) are longer and thinner than those of most Doripp e ( Fig. 10 View FIG ), thus quite similar to those of D. tenuipes ( Fig. 9D View FIG ) but not as thin and elongated as in the latter. The long meri of P2 and P3 of D. trilobata are naked and the dactyli of P2 and especially P3 are enlarged. A characteristic feature of D. trilobata , namely the pleonal somites 2 and 3 with three sharp teeth, is not found in D. tenuipes where there are only low rounded and granular elevations. In D. trilobata , the anterolateral margin is unarmed anterior to epibranchial region and then shows low tubercles, whereas in D. tenuipes it bears numerous denticles. Most significantly, the callosity of D. trilobata is simply hemicircular ( Fig. 15A, C, J View FIG ), contrasting with the complex callosity in the form of a double calcified bulge with a whitish central area in D. tenuipes ( Figs 9D View FIG ; 33G, H View FIG ).The anterolateral margin of the carapace without spines, tubercles or denticles in front of the epibranchial region is as in D. sinica ( Fig. 10C, D View FIG ); but the three detached spines on the lower margin of the orbit contrast with the cluster in D. sinica and the higher number of teeth there in D. quadridens ( Fig. 12B View FIG ) and may approximate the 3-5 teeth of D. frascone ( Fig. 14 View FIG A-D). Dorippe trilobata ( Fig. 15 View FIG A-D) differs from all other species of Dorippe in having a short, triangular and straight-edged pleon, instead of the longer and irregular-edged pleon of other Dorippe ; in addition, the three sharp tubercles on pleonal somites 2 and 3 are much more acute than in D. quadridens ( Figs 10A View FIG ; 11B View FIG ), D. sinica ( Figs 10C View FIG ; 13A View FIG ) and D. frascone ( Fig. 14 View FIG A-D). The relatively small size 20.5 × 21.1 mm of the holotype of D. trilobata cannot account for these differences, so until more material is available this species can be considered valid.

Dorippe glabra (see Manning 1993: 1, fig. 1; cited by Davie 2002: 156), from the north of the Northern Territory, known only by an ovigerous female measuring 24.3 × 26.7 mm (deposited in the AM, see Springthorpe & Lowry 1994) and found mixed in a large collection identified as D. quadridens , “could be distinguished on sight from all of the other specimens in that lot by the naked meri of its P2 and P3”, the most significant feature according to Manning (1993: 2, 4). In photographs of the holotype, a male, the meri of the attached left P2, detached left P3 and detached right P3 are naked, but the merus of the detached right P2 ( Fig. 15E View FIG ) is covered with dense setae on the posterior margin. In D. sinica the meri of P2 and P3 are naked or barely pubescent in females ( Fig. 10D View FIG ) and setose in males ( Fig. 10C View FIG ), whereas they are covered with setae in both sexes of D. quadridens ( Figs 10A, B View FIG ; 12A View FIG ). The P2, P3 of D. glabra (female) are sligthly longer and thinner than in most Dorippe , but not so elongated and thin than those of D. trilobata ( Fig. 15A, B View FIG ), and those of D. tenuipes ( Fig. 9D View FIG ) that are granular. In D. glabra the merus and carpus of the cheliped ( Fig. 15E View FIG ) is covered with dense granules, which eliminates D. frascone with a smooth carpus. In D. glabra the coxa of P3 is flanked by a high hemicircular calcified callosity ( Fig. 15E, F, I View FIG ) similar to that of D. sinica ( Figs 9C View FIG ; 10C, D View FIG ; 33D, E View FIG ), quite distinct from the double callosity of D. tenuipes ( Figs 9D View FIG ; 33G, H View FIG ). A direct comparison between D. glabra and the other Dorippe would be most useful.