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Xandarocarcinidae
Taxonomy
Xandarocarcinidae was named by Karasawa et al. (2011). Its type is Xandarocarcinus.
It was assigned to Dromioidea by Karasawa et al. (2011), Schweitzer et al. (2012); and to Paguroidea by Luque et al. (2017).
It was assigned to Dromioidea by Karasawa et al. (2011), Schweitzer et al. (2012); and to Paguroidea by Luque et al. (2017).
Subtaxa
Acanthodiaulax, Xandarocarcinus (syn. Xandaros) (type genus)
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Xandarocarcinidae Karasawa et al. p. 535 |
| 2012 | Xandarocarcinidae Schweitzer et al. p. 35 |
| 2017 | Xandarocarcinidae 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.
Fm. †Xandarocarcinidae Karasawa et al. 2011
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G. †Xandarocarcinus Bishop 1988
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†Xandarocarcinus sternbergi Rathbun 1926
Invalid names: Xandaros Bishop 1988 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Karasawa et al. 2011 | Carapace wider than long, hexagonal, antero- lateral and posterolateral margins well differentiated, both with spines; posterior margin concave, rimmed. 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. Carapace regions weakly defined, protogastric, hepatic, and epibranchial with large swellings. Cervical groove moderately defined, extending from anterolateral margin just anterior to last anterolateral spine, arcing convex forward, terminating lateral to urogastric region. Branchiocardiac groove obscure laterally, deeper axially, parallel to cervical groove. Postcervical 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 plates not visible, telson reaching middle of sternite 4, all somites free. Female pleon wide, with convex lateral margins, somites without triangular epimeres, uropodal plates 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: base of the Santonian to the top of the Late/Upper Campanian or 85.70000 to 72.20000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Santonian | Canada (British Columbia) | Acanthodiaulax mclayi (207371) | |
| Late/Upper Campanian | USA (California) | Xandaros sternbergi (99312) | |
| Campanian - Maastrichtian | Mexico (Baja California) | Xandaros sternbergi (45700) | |
| Middle Campanian - Late/Upper Maastrichtian | Mexico (Baja California) | Xandaros sternbergi (133568) |