Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Astacus

Astacus (from the Greek αστακός, astacós, meaning "lobster" or "crayfish") is a genus of crayfish found in Europe, comprising three extant (living) species and three somewhat contested extinct species. These crayfish are found across Europe and live exclusively in freshwater, mostly inhabiting the bottom of lakes, ponds, and streams.

Economy & Regions

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Astacus. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Classification

Ecology

Economic significance

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Astacus

Nodes71
Edges70
Triples73
Avg. degree1.97
Density0.028169
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Astacus

Top relations

related to Extant species · 24
Astacus → Balkan Peninsula, British Isles, Central Europe, Europe, European, France, Georgia, Greece, It, Karaman, Kessler, Lake Ohrid, Lake Pamvotida, Like, Linnaeus, Males, North Macedonia/eastern Albania, Pleistocene, Rioni, Scandinavia
related to Fossil species · 11
Astacus → Although, Astacidae, Czech Republic, Emplastron, France, Fritsch, Kafka, The, This, Thus, Van Straelen
related to Reproduction · 9
Astacus → Due, Fertilized, Glair, Once, Reproduction, Since, The, The Astacus, To
related to Economic significance · 8
Astacus → Astacus Fluviatilis, Europe, Historically, Initially, John Henry Clarke, Materia Medica, Middle Ages, This
related to Decline and conservation · 7
Astacus → Additionally, Aphanomyces, Current, Pacifastacus, Researchers, Some, The
related to Classification · 4
Astacus → Astacidae, Astacoidea, Northern Hemisphere, The
related to Description · 2
Astacus → The, Their

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

crayfish species genus found fossil due europe water plague family ventral spermatophore within laevissimus known well marine lobster three across

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
pollution or translocation of species.Astacus colchicus Kesslerinstance ofThe separation from A. astacus likely occurred due to Pleistocene glaciations as well as human impacts0.80text
1876 - can be found in Rioni river basininstance ofThe separation from A. astacus likely occurred due to Pleistocene glaciations as well as human impacts0.80text
temperatureinstance ofReproduction is heavily based on the environmental conditions0.80text
photoperiodinstance ofReproduction is heavily based on the environmental conditions0.80text
when ideal conditions are met fertilization can occurinstance ofReproduction is heavily based on the environmental conditions0.80text
transporting crayfish between water bodiesinstance ofhuman activities0.80text
using infected equipment have facilitated the further spread of the disease.Some noble crayfish populations have developed partial resistance to the plagueinstance ofhuman activities0.80text
surviving for longer than othersinstance ofhuman activities0.80text
Astacusrelated to ClassificationAstacidae0.60section
Astacusrelated to ClassificationNorthern Hemisphere0.60section
Astacusrelated to ClassificationAstacoidea0.60section
Astacusrelated to ClassificationThe0.60section

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.