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Xandarocarcinus
Taxonomy
Xandarocarcinus was named by Bishop (1988). It is not extant. Its type is Zanthopsis sternbergi. It is the type genus of Xandarocarcinidae.
It was assigned to Xandarocarcinidae by Karasawa et al. (2011), Schweitzer et al. (2012) and Luque et al. (2017).
It was assigned to Xandarocarcinidae by Karasawa et al. (2011), Schweitzer et al. (2012) and Luque et al. (2017).
Species
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1988 | Xandarocarcinus Bishop |
| 1988 | Xandaros Bishop p. 252 |
| 2002 | Xandaros Schweitzer et al. |
| 2010 | Xandaros Schweitzer et al. p. 66 |
| 2011 | Xandarocarcinus Karasawa et al. pp. 543 - 545 figs. Fig. 6 |
| 2012 | Xandarocarcinus Schweitzer et al. p. 35 |
| 2017 | Xandarocarcinus Luque et al. p. 40 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Xandarocarcinus Bishop 1988
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†Xandarocarcinus sternbergi Rathbun 1926
Invalid names: Xandaros Bishop 1988 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Bishop 1988 (Xandaros) | 2iV2LX)2LCQ slightly wider than long, transversely oval, widest at anterior third, moderately differentiated by grooves, arched longitudinally. Rostrum short, downturned, sulcate and bifid. Anterolateral margins tightly rounded; orbits large. Posterolateral margins broadly rounded; posterior margin narrow, concave, slightly upturned. Carapace transversely ridged with a gastric ridge, an epibranchial ridge, and a mesobranchial ridge, each surmounted by low bosses. Gastric ridge with four small anterior bosses in diamond shape on anterior tongue of mesogastric and epigastric regions, a large boss at posterior portion of mesogastric region, and two transversely elongate bosses across cardiac region. Abdomen large, somites increasing in length posteriorly. Chelipeds massive, equal; merus, carpus, and propodus tuberculate; claws strongly convex with five longitudinal rows of tubercles; fingers spatulate at tips. | |
| H. Karasawa et al. 2011 | Carapace wider than long, hexagonal, widest at position of last anterolateral spine about half the distance posteriorly on carapace; carapace strongly vaulted longitu- dinally, weakly vaulted transversely. Rostrum extending beyond orbits, axially bifid, axial two spines flanked by second pair of spines posterior to them and separated from them by arcuate segment; orbital margin sinuous, first extending posteriorly in segment parallel to axis, then extending convex forward in short arc, then turning strongly concave posteriorly and arcing anteriorly to outer-orbital spine; outer-orbital spine triangular, directed forward; orbit deep, circular, directed forward; eyestalks short, arcuate, arcing concave forward, well-calcified. Anterolateral margin tightly convex, with three spines excluding outer-orbital spine, increasing in size posteriorly; posterolateral margin nearly straight, with a few small
projections; posterior margin concave, rimmed. Carapace regions weakly defined, protogastric, hepatic, and epibran- chial with large swellings. Cervical groove moderately defined, extending from anterolateral margin just anterior to last anterolateral spine, arcing convex forward, termi- nating lateral to urogastric region. Branchiocardiac groove obscure laterally, deeper axially, parallel to cervical groove. Post-cervical groove present only as weak separation between urogastric and cardiac regions. Sternites 1-3 apparently fused, longer than wide; sternite 4 longer than wide, flattened. Male pleon moderately wide, with parallel sides, somites without triangular epimeres, uropodal plate not visible, telson reaching middle of sternite 4, all somites free. Female pleon wide, with convex lateral margins, somites without triangular epimeres, uropods not visible, telson reaching well anterior to sternite 4, all somites free. Female gonopores coxal, ovate, positioned obliquely in distal position on coxae of third pereiopods. Chelipeds strongly sexually dimorphic, much larger in males than in females; chelae ornamented with rows of tubercles on outer surface of manus and carpus; fingers edentulous except for small spine at tip of fixed finger interlocking with movable finger, finger tips black; pereiopods 2-5 similar in size, none subdorsal. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Turnsek 1997, Aberhan 1992 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Campanian - Maastrichtian | Mexico (Baja California) | Xandaros sternbergi (45700) | |
| Late/Upper Campanian | USA (California) | Xandaros sternbergi (99312) | |
| Middle Campanian - Late/Upper Maastrichtian | Mexico (Baja California) | Xandaros sternbergi (133568) |