Nuttallina crossota ( Berry, 1956 )

Reyes-Gómez, Adriana, Vargas-Ponce, Ofelia, Galván-Villa, Cristian, Salgado-Barragán, José, Esqueda-González, Ma. Del Carmen & Ríos-Jara, Eduardo, 2023, Inventory of chiton species (Polyplacophora) from the rocky intertidal of the Northern Gulf of California, with an illustrated taxonomic key, Zootaxa 5296 (2), pp. 147-178 : 164

publication ID

https://doi.org/ 10.11646/zootaxa.5296.2.2

publication LSID

lsid:zoobank.org:pub:624273A6-3028-42C2-ABE2-A18BBF828156

DOI

https://doi.org/10.5281/zenodo.7973294

persistent identifier

https://treatment.plazi.org/id/795287BF-E446-5505-D0F1-759E70D3F856

treatment provided by

Plazi

scientific name

Nuttallina crossota ( Berry, 1956 )
status

 

Nuttallina crossota ( Berry, 1956) View in CoL

( Figures 3C View FIGURE 3 , 9A–I View FIGURE 9 )

Nuttallina crossota Berry, 1956: 71–74 View in CoL . Chresonymy and synonymy in Ferreira (1982).

Type material. Holotype, SBMNH 34423 About SBMNH from the “Berry collection 15133”.

Type locality. Puerto Peñasco , Sonora, México.

Material examined. Forty-one specimens, BL 8.5– 7.1 mm.

Habitat. In the upper intertidal on medium–sized and small rocks, on exposed rocky massifs, among brown algae that were also under large rocks buried in sand.

Remarks. Nuttallina crossota exhibits irregular granulose sculpture arranged in quincunx ( Figs. 9A–D View FIGURE 9 ); the lateral areas are reduced with 2 elevated thick radial ribs ( Figs. 9B, C View FIGURE 9 ); jugal area with the sculpture, however, usually very much eroded in adult specimens ( Figs. 9B, C View FIGURE 9 ). Girdle densely covered with small elongated, striated spicules and interspersed, thick hyaline spicules ( Figs. 9E–F View FIGURE 9 ). Major lateral radular tooth tricuspid, minor lateral reduced, smaller and shorter than central tooth; central tooth appears as a sub–rectangular plate with its apical edge slightly bent outwards ( Figs. 9H–I View FIGURE 9 ).

The genus Nuttallina was considered a member of the family Callistoplacidae (Pilsbry 1893; Smith 1960) due to the similarity of the insertion slits of the articulamentum and the ribs of the valve tegmentum. Later, this genus was included in the family Lepidochitonidae (see Thiele 1929; Thorpe 1971; Van Belle 1977) based on four characteristics: 1) the tegmentum has granules, 2) the tail valve is smaller than the head valve, 3) the major lateral tooth is tricuspidate, and 4) the girdle scales are small.

Nuttallina crossota is endemic and the only species of this genus in the Gulf of California. At Puerto Peñasco (the type locality), the species was not found, while at Playa Cementerio, the number of the collected individuals was three and at Las Palmas, Bahía Kino two specimens were found. However, at Pie de Faro , Bahía San Felipe, the number of individuals collected was high (36 individuals). Most of the individuals showed an eroded tegmentum on the jugal area of the intermediate valves; some were eroded in the lateral areas as well. At Pie de Faro , Bahía San Felipe, the specimens were found sheltered among brown algae densely covering a large volcanic rock massif with a rough surface, 1.60 m high and 12 m long. During low tide, the rock massif was totally exposed and dry with Nuttallina crossota covered by the algae. In the lower part of the beach, they were observed on (large) submerged rocks semi–buried in sand and buried on the base of the rock massif.

Kingdom

Animalia

Phylum

Mollusca

Class

Polyplacophora

Order

Chitonida

Family

Tonicellidae

Genus

Nuttallina

Loc

Nuttallina crossota ( Berry, 1956 )

Reyes-Gómez, Adriana, Vargas-Ponce, Ofelia, Galván-Villa, Cristian, Salgado-Barragán, José, Esqueda-González, Ma. Del Carmen & Ríos-Jara, Eduardo 2023
2023
Loc

Nuttallina crossota

Berry, S. S. 1956: 74
1956
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF