Mexichromis, Bertsch, 1977

Tibiriçá, Yara, Pola, Marta & Cervera, Juan Lucas, 2017, Astonishing diversity revealed: an annotated and illustrated inventory of Nudipleura (Gastropoda: Heterobranchia) from Mozambique, Zootaxa 4359 (1), pp. 1-133 : 39

publication ID

https://doi.org/ 10.11646/zootaxa.4359.1.1

publication LSID

lsid:zoobank.org:pub:8D06174D-B19F-4B5C-B9B0-DA74E6D43C75

DOI

https://doi.org/10.5281/zenodo.6025891

persistent identifier

https://treatment.plazi.org/id/03EB87A2-FFF6-FFA2-9790-FB73FB78F887

treatment provided by

Plazi

scientific name

Mexichromis
status

 

Mexichromis View in CoL sp.

( Figure 11 E–F View FIGURE 11 , 12 A–D View FIGURE12 )

Material examined. Seven specimens. MB28-004587, ZDRS, 21 Jun. 2012, 30m, 18mm; MHN-YT1223 3spcs., POD, 11 May 2014, 15m, 11–14mm; MB28-004850, 3 spcs., POD, 11 May 2914, 15m, 11–22mm.

Habitats. Subtropical rocky reefs.

Occurrences. Ponta do Ouro and Zavora.

Geographic distribution. Western Indian Ocean. South Africa ( Rudman 1999a) and Mozambique.

Remarks. Mexichromis sp. is externally similar to M. mariei ( Crosse, 1872) . Based on external morphology, Rudman (1999a) was unsure if this species was M. mariei or a different species because of inconsistencies in colour pattern between M. mariei from the Pacific and M. cf. mariei from the western Indian Ocean. Therefore, we examined the radula of one specimen and confirmed Rudman’s (1999a) belief that this species is different from M. mariei . While the radula formula for M. mariei is 55x 27.0.27 (+3) ( Rudman 1983), in the specimen examined it is 22x 15.0.15 (+3) ( Fig. 12 A View FIGURE12 ). Moreover, the very long lateral teeth clearly distinguish these species. The cusp of the lateral tooth is round and the number of denticles varies from two to four ( Fig. 12 B View FIGURE12 ). The innermost tooth has a wider base and four denticles on the outer side; these denticles gradually reduce in size from the cusp to the base ( Fig. 12 C–D View FIGURE12 ). In the inner side of the innermost teeth there are one or two denticles ( Fig. 12 C View FIGURE12 ).

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